package patrol.mobile.com.mobilepatrol.utils;

import com.google.gson.Gson;
import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonParser;
import com.google.gson.reflect.TypeToken;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * Created by shjshi on 2017/8/15.
 */

public class GsonUtil {
    private static Gson gson = null;

    static {
        if (gson == null) {
            gson = new Gson();
        }
    }

    private GsonUtil() {
    }

    /**
     * 转成json
     *
     * @param object
     * @return
     */
    public static String GsonString(Object object) {
        String gsonString = null;
        if (gson != null) {
            gsonString = gson.toJson(object);
        }
        return gsonString;
    }
//    /**
//     * 转成json
//     *
//     * @param object
//     * @return
//     */
//    public static String GsonObj(Object object) {
//        String gsonString = null;
//        if (gson != null) {
//            gsonString = gson.
//        }
//        return gsonString;
//    }

    /**
     * 转成bean
     * 经常用到
     *
     * @param gsonString
     * @param cls
     * @return
     */
    public static <T> T GsonToBean(String gsonString, Class<T> cls) {
        T t = null;
        if (gson != null) {
            t = gson.fromJson(gsonString, cls);
        }
        return t;
    }

    /**
     * 转成list
     * 解决泛型问题
     * 经常用到
     *
     * @param json
     * @param cls
     * @param <T>
     * @return
     */
    public static <T> List<T> jsonToList(String json, Class<T> cls) {
        Gson gson = new Gson();
        List<T> list = new ArrayList<T>();
        JsonArray array = new JsonParser().parse(json).getAsJsonArray();
        for (final JsonElement elem : array) {
            T t;
            try {
                t = gson.fromJson(elem, cls);
            } catch (Exception e) {
                e.printStackTrace();
                continue;
            }
            if (t != null)
                list.add(t);
            else {
                continue;
            }
        }
        return list;
    }


    /**
     * 转成list中有map的
     *
     * @param gsonString
     * @return
     */
    public static <T> List<Map<String, T>> GsonToListMaps(String gsonString) {
        List<Map<String, T>> list = null;
        if (gson != null) {
            list = gson.fromJson(gsonString,
                    new TypeToken<List<Map<String, T>>>() {
                    }.getType());
        }
        return list;
    }

    /**
     * 转成map的
     *
     * @param gsonString
     * @return
     */
    public static <T> Map<String, T> GsonToMaps(String gsonString) {
        Map<String, T> map = null;
        if (gson != null) {
            map = gson.fromJson(gsonString, new TypeToken<Map<String, T>>() {
            }.getType());
        }
        return map;
    }

    /**
     * 转成list
     *
     * @param gsonString
     * @param cls
     * @return
     */
    public static <T> List<T> gsonToList(String gsonString, Class<T> cls) {
        List<T> list = null;
        if (gson != null) {
            list = gson.fromJson(gsonString, new TypeToken<List<T>>() {
            }.getType());
        }
        return list;
    }

    /**
     * map转json
     *
     * @param map hash map
     * @return string
     */
    public static String map2Json(HashMap<String, Object> map) {
        if (gson != null) {
            return gson.toJson(map);
        }
        return "";
    }

    /**
     * map转json
     *
     * @param object hash map
     * @return string
     */
    public static String bean2Json(Object object) {
        if (gson != null) {
            return gson.toJson(object);
        }
        return "";
    }

    /**
     * map转json
     *
     * @param map hash map
     * @return string
     */
    public static String mapString2Json(HashMap<String, String> map) {
        if (gson != null) {
            return gson.toJson(map);
        }
        return "";
    }
}